Brake Pedal Bleed Down

[GeezerGlide06]

I have noticed on and off for about a week that the brake pedal on my 2000 expedition is bleeding down. I only notice it while sitting in a line and having to apply pressure to the pedal for a long period of time. It will bleed down all the way to the floor. I have no indicator lights that have come on. Any suggestions? Thx

 

[nvycrmn]

sounds like air in the line somewhere. change the brakes recently?

 

[GeezerGlide06]

I changed brake pads about 6 months ago. I also just replaced the pcv valve because I thought that maybe I had a vacuum leak. I cannot find any leaks. The pedal still bleeds down after about 1 minute of applied pressure. It also does not matter if the the vehicle is in park or in gear as it still leaks down.

 

[nvycrmn]

i wonder if maybe you have a bad cover for the fluid resevoir, or your master cylinder may be going out.

 

[KWT2000]

unbolt and remove the mater cylinder from the booster and see if it is wet inside the booster/ if so the master is bad

 

[Stoned06]

Either the fluid needs to be changed, or the master cylinder is going bad.